1371
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 12
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1832
- Proper Divisor Sum (Aliquot Sum)
- 461
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 912
- Möbius Function
- 1
- Radical
- 1371
- Omega Function (Ω)
- 2
- Little Omega Function (ω)
- 2
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 114
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- Squarefree Number
- yes
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Related to S(n), the number of self-dual monotone Boolean functions of n variables (A001206): 2^n-th term is S(n).at n=26A001087
- Oscillates under partition transform.at n=36A007213
- Inverse Moebius transform applied twice to squares.at n=36A007433
- Sum of the first n primes.at n=28A007504
- Coordination sequence T1 for Zeolite Code AEI.at n=28A008001
- Coordination sequence T1 for Zeolite Code MEI.at n=27A008146
- Coordination sequence T5 for Zeolite Code CON.at n=26A009872
- a(0) = 1, a(n) = n^2 + 2 for n > 0.at n=37A010000
- Least d such that period of continued fraction for sqrt(d) contains n (n^2+2 if n odd, (n/2)^2+1 if n even).at n=36A013945
- Place where n-th 1 occurs in A007337.at n=39A022777
- Discriminants of quartic fields with 2 complex conjugates (negated).at n=24A023681
- a(n) = least m such that if r and s in {h/(1 + h^2): h = 1,2,...,n} satisfy r < s, then r < k/m < s for some integer k.at n=41A024828
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = A001950 (upper Wythoff sequence).at n=13A025114
- Number of partitions of n into distinct parts >= 2.at n=47A025147
- Sequence satisfies T^2(a)=a, where T is defined below.at n=36A027596
- Number of subgroups of index n of fundamental group of the non-orientable cycle bundle over the Klein bottle.at n=41A027844
- An "extremely strange sequence": a(n+1) = [ A*a(n)+B ]/p^r, where p^r is the highest power of p dividing [ A*a(n)+B ] and p=2, A=4.001, B=1.2.at n=21A028948
- Numbers having period-2 4-digitized sequences.at n=37A031184
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 37.at n=0A031535
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 37.at n=0A031715